Method for adjusting pH of liquid and ph adjustor
A technology for regulating devices and regulating methods, which is applied in chemical instruments and methods, water treatment parameter control, water/sludge/sewage treatment, etc., and can solve problems such as easy corrosion of devices and high salt concentration
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[0057] In the production method of the present invention, the aqueous liquid used in the above step (ii) may be the aqueous solution (A) of the step (i). In this case, the step (ii) is performed in a state where the ion-adsorbing electrodes (E1) and (E2) are immersed in the aqueous solution (A) of the step (i).
[0058] The aqueous liquid treated in step (ii) is a liquid containing water, for example, a liquid in which water accounts for 50% by mass or more (for example, 80% by mass or more or 90% by mass or more). A typical example of an aqueous liquid is water or an aqueous solution.
[0059] In the production method of the present invention, the aqueous liquid in the step (ii) may be different from the aqueous solution (A) treated in the step (i). An example of this situation is given below.
[0060] (1st case)
[0061] In the first example, in the step (i), the conductive substance (C1) adsorbs at least one anion (L) contained in the ion (L) - ).
[0062] Next, in ste...
Embodiment 1
[0141] First, as shown in FIG. 9A , an activated carbon cloth of about 5 cm×6 cm was prepared, and a current collector 91 b coated with Pt on Ti was attached to the activated carbon cloth 91 a to manufacture an activated carbon electrode (ion-adsorbing electrode) 91 . In addition, the activated carbon electrode 92 was produced by the same method. In addition, Ti electrodes were coated with Pt to form counter electrodes 93 and 94 .
[0142] Next, as shown in FIG. 9B , activated carbon electrodes 91 and 92 were disposed between counter electrode 93 and counter electrode 94 , and placed in a box-shaped container with an inner volume of 100 ml. 80 ml of an aqueous NaCl solution having a concentration of 0.01 mol / liter was added to the container.
[0143] Next, a current of 100 mA (0.1A x 180 seconds = 18C) was passed between the activated carbon electrodes for 3 minutes to adsorb chlorine ions to the anode and sodium ions to the cathode in the same manner as in FIG. 1A . Then, w...
Embodiment 2
[0145] The same electrode and NaCl aqueous solution as in Example 1 were prepared, and they were arranged in the same manner as in Example 1. Next, a current of 100 mA (0.1A×180 seconds=18C) was passed between the activated carbon electrodes for 3 minutes to adsorb chlorine ions on the anode and adsorb sodium ions on the cathode. Then, without changing the solution, a current of 60 mA was applied for 20 seconds using the activated carbon electrode having adsorbed sodium ions as the anode and the counter electrode as the cathode, thereby preparing an alkaline aqueous solution. The resulting aqueous solution had a pH of 9.77.
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Abstract
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